119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* RCSID("$OpenBSD: cipher.h,v 1.25 2000/12/19 23:17:56 markus Exp $"); */
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/* RCSID("$FreeBSD$"); */
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#ifndef CIPHER_H
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#define CIPHER_H
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#include <openssl/des.h>
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#include <openssl/blowfish.h>
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#include <openssl/rc4.h>
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#include <openssl/cast.h>
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#include "rijndael.h"
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/*
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* Cipher types for SSH-1. New types can be added, but old types should not
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* be removed for compatibility. The maximum allowed value is 31.
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*/
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#define SSH_CIPHER_SSH2 -3
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#define SSH_CIPHER_ILLEGAL -2 /* No valid cipher selected. */
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#define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
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#define SSH_CIPHER_NONE 0 /* no encryption */
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#define SSH_CIPHER_IDEA 1 /* IDEA CFB */
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#define SSH_CIPHER_DES 2 /* DES CBC */
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#define SSH_CIPHER_3DES 3 /* 3DES CBC */
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#define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */
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#define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */
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#define SSH_CIPHER_BLOWFISH 6
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#define SSH_CIPHER_RESERVED 7
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#define SSH_CIPHER_MAX 31
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typedef struct Cipher Cipher;
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typedef struct CipherContext CipherContext;
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struct CipherContext {
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union {
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struct {
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des_key_schedule key;
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des_cblock iv;
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} des;
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struct {
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des_key_schedule key1;
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des_key_schedule key2;
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des_cblock iv2;
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des_key_schedule key3;
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des_cblock iv3;
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} des3;
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struct {
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struct bf_key_st key;
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u_char iv[8];
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} bf;
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struct {
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CAST_KEY key;
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u_char iv[8];
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} cast;
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struct {
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u4byte iv[4];
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rijndael_ctx enc;
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rijndael_ctx dec;
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} rijndael;
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RC4_KEY rc4;
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} u;
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Cipher *cipher;
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};
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struct Cipher {
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char *name;
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int number; /* for ssh1 only */
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u_int block_size;
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u_int key_len;
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void (*setkey)(CipherContext *, const u_char *, u_int);
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void (*setiv)(CipherContext *, const u_char *, u_int);
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void (*encrypt)(CipherContext *, u_char *, const u_char *, u_int);
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void (*decrypt)(CipherContext *, u_char *, const u_char *, u_int);
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};
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u_int cipher_mask_ssh1(int client);
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Cipher *cipher_by_name(const char *name);
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Cipher *cipher_by_number(int id);
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int cipher_number(const char *name);
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char *cipher_name(int id);
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int ciphers_valid(const char *names);
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void cipher_init(CipherContext *, Cipher *, const u_char *, u_int, const u_char *, u_int);
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void cipher_encrypt(CipherContext *context, u_char *dest, const u_char *src, u_int len);
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void cipher_decrypt(CipherContext *context, u_char *dest, const u_char *src, u_int len);
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void cipher_set_key_string(CipherContext *context, Cipher *cipher, const char *passphrase);
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#endif /* CIPHER_H */
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